I have code (mobile-admin) that sets index_template to ['admin/index.html', 'index.html']. The current call ends up passing [['admin/index.html', 'index.html']] to TemplateResponse, which fails with a TypeError trying to use ['admin/index.html', 'index.html'] as a template.

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I have code (mobile-admin) that sets index_template to `['admin/index.html', 'index.html']`. The current call ends up passing `[['admin/index.html', 'index.html']]` to `TemplateResponse`, which fails with a `TypeError` trying to use `['admin/index.html', 'index.html']` as a template.